Merge pull request #79057 from rphillips/fixes/e2e_kubelet_stats_fix

kubelet_stats: fix potential e2e crash dereferencing ContainerStats.CPU

test/e2e/framework/kubelet_stats.go

@@ -599,6 +599,9 @@ func (r *resourceCollector) collectStats(oldStatsMap map[string]*kubeletstatsv1a
 		}
 
 		if oldStats, ok := oldStatsMap[name]; ok {
+			if oldStats.CPU == nil || cStats.CPU == nil || oldStats.Memory == nil || cStats.Memory == nil {
+				continue
+			}
 			if oldStats.CPU.Time.Equal(&cStats.CPU.Time) {
 				// No change -> skip this stat.
 				continue